It is extremely unlikely for a numbe of reasons:
- It would be a mamoth undertaking for which you would have to find interested people to have the requisite skills and have the motivation to put the time. Current Calibre developers are more interested in enhancing the product on the current platforms.
- There are a HUGE number of dependencies that would also need porting. Most of the requirements (e.g. the latest Qt libraries) are maintained by 3rd parties
- Does Android even have a Python v2.7 environment (which is what most of Calibre is written in.
- Porting the C code also used in Calbre is likely to be an issue as Android does not (I believe) provide support for native C apps.
- Android systems are almost certainly underpowred and short of resources for running Calibre. This may well change ove time, but by then Android will have moved on from 2.2.